login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A024226 Expansion of sin(tan(x))*x/2. 0
0, 1, 2, -9, -1100, -75075, -5809002, -539002541, -59464355288, -7592385703239, -1074268351907350, -154802785066664977, -17096549995588876452, 2134127408928272414709, 3318524295428311509715966 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

Sin[ Tan[ x ] ]*x/2 (* Even Part *)

CROSSREFS

Cf. A009508.

Sequence in context: A253604 A067691 A062840 * A252584 A305851 A208207

Adjacent sequences:  A024223 A024224 A024225 * A024227 A024228 A024229

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 4 00:33 EST 2020. Contains 338920 sequences. (Running on oeis4.)